release.yml

name: Release

on:
  push:
    branches:
      - master
    paths:
      - 'package.json'
  workflow_dispatch:

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/master'
    steps:
      - name: Checkout
        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
        with:
          fetch-depth: 2
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Detect version change
        id: version
        run: |
          current=$(jq -r '.version' package.json)
          previous=$(git show HEAD~1:package.json | jq -r '.version // "0.0.0"')
          echo "current=$current" >> "$GITHUB_OUTPUT"
          echo "previous=$previous" >> "$GITHUB_OUTPUT"
          if [ "$current" != "$previous" ]; then
            echo "changed=true" >> "$GITHUB_OUTPUT"
            echo "Version changed: $previous → $current"
          else
            echo "changed=false" >> "$GITHUB_OUTPUT"
            echo "Version unchanged ($current), skipping release"
          fi

      - name: Check if tag already exists
        id: tag_check
        if: steps.version.outputs.changed == 'true'
        run: |
          tag="v${{ steps.version.outputs.current }}"
          if gh api "repos/${{ github.repository }}/git/refs/tags/$tag" >/dev/null 2>&1; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
            echo "Tag $tag already exists, skipping release"
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create GitHub Release
        if: steps.version.outputs.changed == 'true' && steps.tag_check.outputs.exists == 'false'
        uses: softprops/action-gh-release@3bb12739c298aeb8a4eeaf626c5b8d85266b0e65  # v2
        with:
          tag_name: "v${{ steps.version.outputs.current }}"
          name: "v${{ steps.version.outputs.current }}"
          generate_release_notes: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}